Bone Metastasis: Symptoms, Causes, and Treatment
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer: What is bone metastasis?
Bone metastasis is cancer that has spread from a tumor elsewhere in the body into one or more bones, most commonly the spine, pelvis and thigh bone. Symptoms include bone pain, bones that break easily and high blood calcium; spine involvement can cause limb weakness and loss of bladder or bowel control. Treatments include bone-strengthening medicines, radiation and surgery.
What the research says
A bone-targeted antibody delayed skeletal complications more than zoledronic acid in breast cancer. In a randomized, double-blind study of about 2,046 women with breast cancer that had spread to bone (1,026 on subcutaneous denosumab, 1,020 on intravenous zoledronic acid, both every 4 weeks), denosumab delayed the time to a first skeletal-related event such as a fracture, bone radiation or surgery, or spinal cord compression (hazard ratio 0.82; 95% CI 0.71 to 0.95) and lowered the rate of multiple events (rate ratio 0.77; 95% CI 0.66 to 0.89). Overall survival was similar. Zoledronic acid caused more kidney problems and acute-phase reactions, denosumab more low calcium, and osteonecrosis of the jaw was uncommon in both groups (2.0% vs 1.4%) (Stopeck et al., J Clin Oncol, 2010) [3].
Precise spine radiation relieved pain completely more often than conventional radiation. In a randomized trial of 229 people with painful spinal metastases, stereotactic body radiotherapy (24 Gy in two fractions) produced a complete pain response at 3 months in 35% (40 of 114) versus 14% (16 of 115) with conventional radiotherapy (20 Gy in five fractions) (risk ratio 1.33; 95% CI 1.14 to 1.55; p=0.0002), with similar rates of serious side effects (Sahgal et al., Lancet Oncol, 2021) [4].
What does bone metastasis actually mean?
Bone metastasis happens when cancer cells break away from where they started and spread to a bone. The medical word for this spread is metastasis. When cancer spreads, doctors say it metastasizes or is metastatic.
One spot of spread in a bone is called bone metastasis. When there is more than one area of spread in the bones, it is called bone metastases.
A useful way to think about it: bone metastasis is not a new kind of cancer. It is the original cancer traveling. Breast cancer that reaches a bone is still breast cancer.
Nearly all types of cancer can spread to the bones. Some types do it more often. The most common include breast cancer, prostate cancer, and lung cancer.
Where in the body does bone metastasis tend to happen?
Bone metastasis can develop in any bone in the body. It more often happens in the spine, the pelvis, and the thigh bones.
This location detail matters for two reasons. Pain in the lower back or hip is one of the most common ways bone metastasis announces itself. And spread in the spine can press on the spinal cord, which changes the symptoms and raises the urgency.
When does bone metastasis usually appear?
Bone metastasis may be the first sign that you have cancer. It is how some people find out something is wrong.
It can also appear years after cancer treatment has ended. A new ache long after treatment is a reason to call your care team, not something to dismiss.
What symptoms of bone metastasis should you watch for?
Sometimes bone metastasis causes no signs or symptoms at all. That is one reason follow-up after cancer treatment matters.
When symptoms do appear, they usually involve pain. Bone pain is the most common symptom. It may start as a dull ache and gradually worsen, and it can become constant.
Bones weakened by the spread can break easily. A fracture from a minor bump or even no injury at all can be the first clear sign.
Symptom | What it can signal |
Bone pain, often in the back, hip, or thigh | Cancer cells growing in the bone |
A bone that breaks from a minor bump or no injury | The bone has been weakened by the cancer |
Nausea, vomiting, constipation, confusion | High blood calcium (hypercalcemia) released from damaged bone |
Weakness in the legs or arms | Pressure on the spinal cord in the spine |
Urine leaking or a sudden urge to urinate | Pressure on the nerves that control the bladder |
Loss of control over bowel movements | Pressure on the nerves that control the bowel |
How can bone metastasis cause high blood calcium?
When cancer damages bone, calcium can be released into the bloodstream. This raises blood calcium levels, a condition called hypercalcemia.
Hypercalcemia can cause nausea, vomiting, constipation, and confusion. The confusion is easy to mistake for tiredness or normal aging. Any of these signs alongside bone pain deserves a call to a healthcare professional.
What warning signs suggest bone metastasis in the spine?
If bone metastasis is in the spine, it can press on the spinal cord. This creates a recognizable cluster of symptoms that should never wait.
The cluster includes pain and stiffness in the neck or back, weakness in the arms and legs, leaking urine or a sudden urge to urinate, and loss of control over bowel movements. New weakness in the arms or legs, or loss of control of your bladder or bowels, is a reason to seek emergency medical care.
When should you see a doctor about bone metastasis?
If you have long-lasting symptoms that worry you, make an appointment with a doctor or other healthcare professional. This advice applies to everyone.
If you have been treated for cancer in the past, the bar is lower. Tell your healthcare team about your medical history and your concern about your symptoms, even if your treatment ended years ago.
How does cancer spread to bone and cause bone metastasis?
Bone metastasis is caused by cancer that starts in one area and spreads to a bone. Cells from the original tumor break away, travel through the body, and begin growing in bone tissue.
Doctors are not certain why some cancers travel to the bones rather than to other common sites of spread, such as the liver. The pattern is well recognized, but the underlying reason is still an open question in cancer research.
Which cancers are most likely to cause bone metastasis?
Anyone with cancer can develop bone metastases, but the risk depends largely on the type and extent of the original cancer. The cancers most likely to spread to bone are:
Cancer type | Note |
Breast cancer | One of the most common sources of bone metastasis |
Prostate cancer | One of the most common sources of bone metastasis |
Lung cancer | Commonly spreads to bone |
Kidney cancer | Frequently involves bone spread |
Thyroid cancer | Can spread to bone |
Melanoma | Skin cancer that can spread to bone |
How is bone metastasis diagnosed?
To diagnose bone metastasis, a healthcare professional may suggest imaging tests. These give a picture of what is happening inside the bone.
Test | What it shows |
X-ray | Basic pictures of the bone, useful for finding damage |
Bone scan (bone scintigraphy) | A scan of the whole skeleton that spots areas of abnormal bone activity |
CT scan | Detailed cross-section pictures of bones and nearby tissue |
MRI scan | Detailed pictures of soft tissue, useful when the spine is involved |
PET scan | A scan that highlights areas of high cancer activity in the body |
To confirm the diagnosis, the healthcare professional might suggest a biopsy. A biopsy is a procedure that removes a sample of tissue for testing in a lab.
How is bone metastasis treated with medicines, radiation and surgery?
Common treatments for bone metastasis include medicines, radiation therapy, and surgery. Your healthcare team selects the treatments that are best for you based on your situation.
Treatment cannot usually cure cancer that has spread this way. What it can do is meaningful: reduce pain, strengthen bone, prevent breaks, and slow the growth of the cancer.
Bone-building medicines
Bone-building medicines help strengthen the bones. They are often used to treat thinning bones, a condition called osteoporosis. They also help treat bone metastasis.
These medicines can strengthen the bones and reduce the pain caused by bone metastasis. That often lowers the need for strong pain medicines. They also may lower the risk of developing new bone metastasis.
Bone-building medicines are given every few weeks through a vein in the arm or through a shot. A pill form exists, but it may not work as well for bone metastasis.
They can cause kidney problems and short-term bone pain. They also increase the risk of a rare but serious jawbone condition called osteonecrosis. A dental checkup is often part of starting these medicines.
Medicines that deliver radiation to bone
Radiopharmaceuticals are medicines that contain a low level of radioactive material. They are given through a vein.
Once in the body, the medicines travel to the cancer in the bones and deliver the radiation directly there. For bone metastasis, these medicines may help relieve bone pain.
They might be an option when there is more than one bone metastasis. Side effects can include damage to the bone marrow, which can lead to low blood cell counts.
Chemotherapy and hormone therapy
Chemotherapy treats cancer with strong medicines. If cancer has spread to more than one bone, a healthcare professional may suggest chemotherapy.
Hormone therapy blocks certain hormones in the body. Some cancers, especially breast and prostate cancers, use the body's hormones to help them grow. Blocking those hormones can help control the cancer.
Hormone therapy may involve medicines that lower hormone levels or block the action of hormones on cancer cells. Another choice is surgery to remove the organs that make the hormones the cancer cells use, such as the ovaries or the testes.
Pain medicines
Pain medicines work to control the pain bone metastasis causes. You might take pain relievers available without a prescription or stronger prescription pain relievers.
It may take time to find the mix of pain medicines that works best for you. If you take pain medicines but still have pain, tell your healthcare professional. A pain specialist may be able to offer more choices for pain relief.
Targeted therapy
Targeted therapy uses medicines that attack specific chemicals in cancer cells. By blocking these chemicals, targeted treatments can cause cancer cells to die.
Your cancer cells may be tested to see if targeted therapy is likely to work for you. The side effects of targeted therapy medicines depend on which medicine you receive.
Radiation therapy
Radiation therapy treats cancer with powerful energy beams. The energy can come from X-rays, protons, or other sources.
Radiation therapy can treat one or a few areas of bone metastasis. It typically is not used if there are many areas. Radiation cannot rebuild bone weakened by cancer, but it can help ease pain and control the growth of the bone metastasis.
Radiation to the bone can be given in one treatment or several treatments over many days. Side effects depend on the site being treated and its size.
Precise radiation for the spine
Stereotactic body radiotherapy is a highly precise, intense form of radiation. It aims beams of radiation from many angles at the cancer. It most often is done in one or a few treatments.
This treatment might be used for bone metastasis in the spine bones. It allows healthcare professionals to target the treatment to the cancer without hurting the spinal cord.
Surgery to stabilize and repair bone
Surgical procedures can help a bone that is at risk of breaking or repair a bone that has already broken.
Approach | How it works |
Orthopedic fixation | Metal plates, screws, and rods stabilize a bone in danger of breaking |
Bone cement injection | Cement is injected to help broken pelvic or spine bones that cannot be stabilized with metal |
Fracture repair | Metal plates, screws, and nails repair a broken bone; joint replacement such as hip replacement may be another choice |
One detail surprises many people: putting a cast on a bone broken by bone metastasis most often does not help. The bone is weakened by the cancer, and it usually needs more than a cast.
Ablation therapy: heat and cold
Ablation therapy procedures apply treatment directly to the cancer cells. These procedures use heat or cold to kill cancer cells.
Ablation may help control pain caused by bone metastasis. It may be a choice if you have one or two areas of bone metastasis that other treatments have not helped.
In radiofrequency ablation, a needle with an electric probe is placed into the cancer. Electricity passes through the probe and heats the tissue around it. After the tissue cools, the process is done again.
In cryoablation, the cancer is frozen and then allowed to thaw. After the tissue thaws, the process is done again.
Side effects can include damage to nearby structures, such as nerves, and damage to bones that can increase the risk of a broken bone.
Physical therapy and clinical trials
A physical therapist can work with you to make a plan that will help you get stronger and move better. A physical therapist may suggest assistive devices, such as crutches or a walker to take weight off a bone while walking, a cane to improve balance, or a brace to keep the spine stable. A physical therapist also may suggest exercises to help you keep your strength up and reduce your pain.
Clinical trials are studies of new treatments and new ways of using existing treatments. Taking part gives you a chance to try the latest treatments. A cure is not guaranteed, and the side effects of new treatments may not be known. Ask your healthcare professional whether clinical trials may be an option for you.
How can people cope with bone metastasis and find support?
Coping with bone metastasis involves more than coping with bone pain. It also involves coming to terms with the news that your cancer has spread.
Treatments can slow the growth of the cancer and may extend your life. But cancer that spreads can be hard to cure. The care team works to ease your pain and keep you comfortable so you can focus on what matters to you.
People cope in their own ways. Useful starting points include learning enough about the condition to help decide about care, finding a good listener among friends, family, or a counselor, and connecting with other people who have cancer through support groups.
Faith, chaplains, psychologists, and medical social workers all play roles for some people. Reviewing end-of-life wishes with a healthcare professional and sharing them with loved ones brings some people comfort. If cancer therapies no longer work or are no longer wanted, hospice care provides medical, emotional, and spiritual support focused on comfort.
How should you prepare for a bone metastasis appointment?
If you have symptoms that worry you, start by making an appointment with a doctor or other healthcare professional. If you were treated for cancer in the past, mention it even if the treatment was many years ago. After a diagnosis of bone metastasis, you may be referred to a specialist, often a doctor who treats cancer, called an oncologist.
When you make the appointment, ask about any pre-appointment restrictions, such as diet limits. Write down your symptoms, including any that do not seem linked to the reason for the appointment. Bringing a trusted friend or family member to listen and take notes can help you absorb everything that is discussed.
What is the bottom line on bone metastasis?
Bone metastasis means cancer has traveled from where it started to one or more bones, most often in the spine, pelvis, or thigh bone. It can be silent at first, which is why bone pain, easy fractures, and signs of high blood calcium deserve attention, and why any history of cancer makes new symptoms worth reporting early.
The treatment picture is broader than many people expect. Bone-building medicines, precise radiation, stabilization surgery, ablation, pain medicine, and physical therapy all have roles, and the team chooses the mix based on your situation.
If you are dealing with bone pain or have a cancer history and new symptoms, the next step is a conversation with a healthcare professional. Bring your symptom list, your cancer history, and your questions.
Next steps: If you are dealing with bone pain or have a cancer history and new symptoms, talk with a healthcare professional. Bring your symptom list, your cancer history, and your questions.
FAQ
Is bone metastasis the same as bone cancer?
No. Bone metastasis is cancer that started somewhere else in the body, such as the breast or prostate, and spread to a bone. It keeps the name of the original cancer. Primary bone cancer, by contrast, starts in the bone itself.
What does bone metastasis pain feel like?
Bone metastasis pain is often described as a deep, dull ache in the bone, commonly in the back, hip, or thigh. It tends to worsen over time and can become constant, sometimes worse at night.
Why do people with bone metastasis get high blood calcium?
Cancer damaging bone can release calcium into the bloodstream, raising blood calcium levels. This causes nausea, vomiting, constipation, and confusion, and it is a reason to contact a healthcare professional.
Can a broken bone heal if the break is caused by bone metastasis?
A bone broken by bone metastasis usually needs more than a cast, because the bone is weakened by the cancer. Treatment often involves surgery with metal plates, screws, or rods, or bone cement, along with cancer treatment.
Is bone metastasis curable?
It is rare for cancer that has spread to the bones to be cured. Treatment aims to control pain, strengthen the bone, prevent breaks, and slow the cancer's growth, and in many cases can extend life and protect quality of life.
Disclaimer: This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified health care provider for individual questions, especially if you have a history of cancer.
Related Reading
Bone Scan: What It Shows, How It's Done, Results and Risks explains the nuclear medicine scan that finds cancer spread, fractures and infection in bone.
References
Mayo Clinic Staff. Bone metastasis - Symptoms & causes. Mayo Clinic. August 20, 2026. https://www.mayoclinic.org/diseases-conditions/bone-metastasis/symptoms-causes/syc-20370191
Mayo Clinic Staff. Bone metastasis - Diagnosis and treatment. Mayo Clinic. August 20, 2026. https://www.mayoclinic.org/diseases-conditions/bone-metastasis/diagnosis-treatment/drc-20370196
Stopeck AT, et al. Denosumab compared with zoledronic acid for the treatment of bone metastases in patients with advanced breast cancer: a randomized, double-blind study. J Clin Oncol. 2010;28(35):5132-9. PMID 21060033. https://doi.org/10.1200/JCO.2010.29.7101
Sahgal A, et al. Stereotactic body radiotherapy versus conventional external beam radiotherapy in patients with painful spinal metastases: an open-label, multicentre, randomised, controlled, phase 2/3 trial. Lancet Oncol. 2021;22(7):1023-1033. PMID 34126044. https://doi.org/10.1016/S1470-2045(21)00196-0
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